colchicine

A poisonous alkaloid (chemical formula
C22H25NO6) found in the corm of the autumn
crocus or meadow saffron (Colchicum autumnale). It is used in genetic
and cellular research, as it inhibits mitosis
(cell division). This property makes colchicine valuable in cancer research
and as immunosuppressant drug.
Melting point 156°C.